gringo

In mexico and other latin american countries that are Spanish-speakers it refers mainly to people from US but can be used to describe foreigners from other countries as well. In Brazil the term "gringo" (in portuguese) usually refers to people from Argentina. In Brazil Americans are mostly called just "Americanos" or "Norte-Americanos" rather than "Gringos" (which is more used by people in memes usually refering to English Speakers in general) or "Estadunidense" (considered by many people an ugly and long term)

(Portuguese) São gringos, só falam espanhol. // They're foreigners, they only speak spanish.
(Spanish) No comprendo lo que dices gringo, no hablo inglés. // I don't understand what you're saying foreigner, I don't speak English